Maurice gandy



(No Model.)

M. GANDY.

CANVAS BELTING.

Patented Nov. 9, 1886.

N. PETERS, Fhuluinha m lwr. washin wn. B. C.

UNITED STATES PATENT MAURICE GANDY, OF NEW BRIGHTON, COUNTY OF CHESTER, ENGLAND, ASSIGNOR TO THE GANDY BELT MANUFACTURING COMPANY, (LIMITED) CANVAS BELTI NG.

SPECIFICATION forming part of Letters Patent No. 352,460, dated November 9, 1886.

Application filed January 12, 1886. Serial No. 188,313. (No model.)

To all whom it may concern:

Beit known that I, MAURICE GANDY, a subject of the Queen of Great Britain, residingin New Brighton, county of Chester, England, have invented certain new and useful Improve ments in Canvas Belts for Driving Machinery and in the Means and Method of Making the Same, of which the following is a description in such full, clear, concise, and exact terms as IO to enable any one skilled in the arts to which it appertains or with which it is most nearly related to make and use the same, reference being had to the accompanying drawingsmaking part of this specification, and to the figures l 5 and letters of reference marked thereon.

Figure 1 is a plan of said belt, and Fig. 2 a cross-section through the same. Fig. 3 is a plan of an apparatus upon which the belt is constructed; and Figs. 4 and 5 show a novel method of constructing a belt, as hereinafter described.

My invention consists of a canvas belt composed of a plurality of plies of canvas, each ply woven to the exact width it is desired to 2 5 make the belt, each width and ply to be separate and distinct from all the rest and having a selvage on each edge thereof, the several plies being then piled one on the other flatwise, and stitched together longitudinally by rows of stitching aboutthree-eighths of an inch apart and close along each edge of the belt, by which means the hard-selvage edge of the several plies are drawn hard upon each other, thus making the two edges of the belt to con- 3 5 sist of a combination of separate and distinct hard-selvage edges united by a row of stitch-" ing. By this means the belt is preventedfrom fraying and going to pieces when running between shifting forks, as in the case of -folded 4o belts.

My invention further consists of forming a canvas belt around a pair of pulleys or circular forms to correspond sufficiently for all practical purposes with the pulleys upon which the belt is to run when in actualservice, by which means the several plies composing the beltincrease in length from the inside outward, the thicker the belt being the longer will be the outside ply. In a belt made in this way all.

the plies will draw exactly alike and the inside plies will not crimp, wrinkle, or out upon the pulleys.

Being a manufacturer of canvas belts,l am of course aware that it is a common practice to make such belts of several thicknesses of canvas, the canvas being folded to the desired thickness to form the belt, the folding being so arranged as to inclose the selvage Within the folds of the belt, the several folds being then stitched together. This methodof makingthe belt develops tw.o objections: first, the folded edges in running through shifting-forks are cut 05, causing the canvas to fray and disintegrate the belt; second, all of the plies'composing the belt are parts of the same width of canvas, and must therefore necessarily be of the same length, and the belt must necessarily crimp or wrinkle on the pulleys, and where the pulley issmall and the velocity high this objection becomes very serious, the belt mp '70" idly cutting itself to pieces.

In making a belt composed of folded canvas it is impossible to construct it over a form, making the outside plies longer than the inside ones, as I have above described, for the reason that all of the plies are integral parts of each other.

Referring now to' the drawings, Fig. 1 is a plan of the finished belt, and it of course shows also a plan of each separate ply of canvas composing it, the edges being both selvage and stitched together as near the edge as practicable to draw the several selvages ot' the several plies hard together, as above described. In stitching the belt, the tension of the stitching-thread should be as tight as convenient, to draw the several plies of canvas hard upon each other, as shown by Fig. 2.

The apparatus used for constructing the belt upon is illustrated substantially by Fig. 3, which is a horizontal section through the apparatus A, A being a pair of rollers or loose pulleys turning freely upon their axes, which may be set vertically or horizontally, as may be thought most convenient. B is a framepiece, in which slots C are made to carry suitable journal-boxes, to support and contain the ends of the roller-shafts. These journal-boxes are connected to screws D, set in the framepiece, by which the rollers or pulleys are shifted I00 to or from each other, thus adapting the form to belts of different lengths, and of course different-sized rollers or pulleys may be used in the frame, to suit the exigencies of each case. There are of course two frame-pieces, like B, held apart by suitable joist or timber, each frame piece carrying one end of the roller or pulley shaft, this frame being constructed substantially as above described. The inside ply of canvas, (1, is drawn over them, and the ends tacked together, as at b. A second ply, c, is then drawn over the first one. and the ends tacked, as at d, and so on changing the place of the joints of each ply, as at e f, until the belt is laid up to the desired thickness. These several plies, being drawn snugly upon each other, are'then tacked together, and then taken 011 the former and stitched on the sewing-niachine, as above described. Another and substantially the same method of making and joining the belt is illustrated by Fig. 5. In this case a long strip of canvas is woven of the desired width and wrapped upon the pulleys of the former, one ply on another, until the desired thickness is obtained. The several plies are then tacked together, and stitched together as before, the ends lapping, as at 'g h. By these means it will be observed that an endless belt is made. not only to exactly fit the pulleys upon'which it is to run, and having no tendency to wrinkle, but is also made without splicing, as in the ordinary endless belt.

In making these belts, I prefer to join the ends diagonally, as at Fig. 4, and to have the canvas hard woven and the warp-thread longer than the weft; and I also prefer to soak them in oil, press, and stretch them; but I do not intend to make these features a part of my patent.

I have described the best way of making the belt, and understand that any merely formal change will be included by the description, the substantial features of novelty which I desire to patent being designated in the following claims.

I claim-- 7 I. A belt for driving machinery, composed of a plurality of single thicknesses of canvas woven to the exact width it is desired to make the belt and having its selvage on each edge closely united by and combined with a row of stitching, thus augmenting the strength and hardness of the selvage by the strength of the stitching, substantially as described.

2. In a belt composed of a plurality of separate plies fastened together, a gradual increase in the length of the several plies from theinside to the outside of the belt, for the purpose of equalizing the strain on each ply and to avoid wrinkling of the inside plies, substantially as described.

3. A canvas belt composed of several separate and distinct plies of canvas, built up one upon the other, and stitched together, as

described forming an endless belt. constructed and joined substantially as described. 7

MAURICE GANDY.

Witnesses: I

Amos BROADNAX, J r., J. EDGAR BULL. 

